/Engine/Source/Developer/MeshUtilities/Public/MeshUtilities.h
This function create the import data using the LODModel. You can call this function if you load an asset that was not re-import since the build refactor and the chunking is more agressive than the bake data in the LODModel. You can also need this function if you create a skeletalmesh with LODModel instead of import data, so your newly created skeletalmesh can be build properly.
void CreateImportDataFromLODModel ( [USkeletalMesh](API\Runtime\Engine\Engine\USkeletalMesh) * SkeletalMesh ) const